Overview

This project consists of the game of Pong being displayed to a uLCD, with paddles being controlled by photocell resistors. The game starts at the sound of a buzzer. The Ball bounces on the horizontal walls, and the aim of the game is to stop the ball from hitting the vertical borders. In order to do that, the paddles, which are controlled by photocell resistors can be moved vertically. To go upwards, increase the light on the photocell resistors and to move down, reduce the light being taken in to the photocell resistors. A buzzer sounds at the beginning and at the end of the game, and a thread allows a small sound to be made when the ball collides on the borders.

This is a picture of the wiring for the game.

Figure 1. Wiring of Game

Setup

The components that were used (as can be seen in figure 1) were

• 1 mbed
• 1 uLCD
• 1 Speaker
• 1 Op Amp
• 1 220-1k Resistor
• 1 SD Card Reader
• 2 Photocell Resistors
• 2 10 Ohm Resistors

Circuit

Below we have some diagrams of the pinouts of the components above.

SD Card

SparkFun MicroSD Breakout Board

uLCD

Speaker

The Speaker uses pin 18.

Photocell resistors

The photocell Resistor for the left paddle uses pin 15. The photocell Resistor for the right paddle uses pin 16.

Gameplay

Source Code

The Code uses the following libraries

• mbed.h
• uLCD_4DGL.h
• SDFileSystem.h
• wave_player.h
• <string>
• rtos.h

The code is the following